In Commit 5e82d54 you have added the option --end-of-options to every command.
In theory this should just work and also the documentation 2.35.1 and 2.25.1 mention this option.

But on both versions specifically the latest for ubuntu 20.04 and 2.35.1 as it's used on Ubuntu 20.04 in github actions always fail for me with the --end-of-options option enabled.

user@machine:~/testrepo$ git checkout --end-of-options test
error: pathspec '--end-of-options' did not match any file(s) known to git
error: pathspec 'test' did not match any file(s) known to git

user@machine:~/testrepo$ git checkout test
Switched to branch 'test'

user@machine:~/testrepo$ git --version
git version 2.25.1

The above is from my server running ubuntu 20.04 with latest version of git, the exact same behaviour happens in github actions for me.

Edit: fixed wrong link